Disable flaky tests dotnet#3031

Author: MichelZ

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ExceptionTest/ConnectionExceptionTest.cs

@@ -19,6 +19,7 @@ public class ConnectionExceptionTest
         private const string orderIdQuery = "select orderid from orders where orderid < 10250";
         private static bool IsNotKerberos() => DataTestUtility.IsKerberosTest != true;
 
+        [ActiveIssue("https://github.com/dotnet/SqlClient/issues/3031")]
         [ConditionalFact(nameof(IsNotKerberos))]
         public void TestConnectionStateWithErrorClass20()
         {

src/Microsoft.Data.SqlClient/tests/ManualTests/TracingTests/EventCounterTest.cs

@@ -146,6 +146,7 @@ public void EventCounter_StasisCounters_Functional()
             Assert.Equal(0, SqlClientEventSourceProps.StasisConnections);
         }
 
+        [ActiveIssue("https://github.com/dotnet/SqlClient/issues/3031")]
         [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup))]
         public void EventCounter_ReclaimedConnectionsCounter_Functional()
         {